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• Detect two specific objects collision with bullet physics

  - by sebap123

  I have got some problem with defining collision between objects in my game using bullet physics. I know that objects are colliding with each other simultaneously and I don't have to do anything more. However I need to be noticed when one object collides with one of the rest. It is quite awkward written so I will tell what I want to achive. I have got ball which hits wall from tubes. Everything is on the floor. When ball hits wall some fragments fall down to infinity. So I have got bellow floor btStaticPlaneShape. This is place where most of objects is stoping and then I can start another action. But not all of them. So I've been trying to use function checkCollideWith but it isn't good method as it was said in reference and wiki. So I've checked method described in wiki http://bulletphysics.org/mediawiki-1.5.8/index.php/Collision_Callbacks_and_Triggers called contact information. This isn't good method either because it is extremly hard to identify what is what when colliding. You have to also remember that ball is almost all the time colliding with something - floor, wall or eart level. So is there any other method to check what is colliding with what?

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• How do I move the camera sideways in Libgdx?

  - by Bubblewrap

  I want to move the camera sideways (strafe). I had the following in mind, but it doesn't look like there are standard methods to achieve this in Libgdx. If I want to move the camera sideways by x, I think I need to do the following: Create a Matrix4 mat Determine the orthogonal vector v between camera.direction and camera.up Translate mat by v*x Multiply camera.position by mat Will this approach do what I think it does, and is it a good way to do it? And how can I do this in libgdx? I get "stuck" at step 2, as I have not found any standard method in Libgdx to calculate an orthogonal vector. EDIT: I think I can use camera.direction.crs(camera.up) to find v. I'll try this approach tonight and see if it works. EDIT2: I got it working and didn't need the matrix after all: Vector3 right = camera.direction.cpy().crs(camera.up).nor(); camera.position.add(right.mul(x));

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• How can I compile SM 3.0 effects in D3D11 in slimdx?

  - by jacker

  var bytecode = ShaderBytecode.CompileFromFile("shaders\\testShader.fx", "fx_5_0", ShaderFlags.None, SlimDX.D3DCompiler.EffectFlags.None, null, null, out str); var effect = new SlimDX.Direct3D11.Effect(gpu.Device, bytecode); Works fine but if I try to use another shader model like 4.0 or 3.0 it throws an error on the new effect creation: E_FAIL: An undetermined error occurred (-2147467259) How do I compile older shaders? And I've read about device context but I can't find any information on how to use them to maintain DX9 compatibility.

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• How to prevent a hacked-server from spoofing a master server?

  - by Cody Smith

  I wish to setup a room-based multilayer game model where players may host matches and serve as host (IE the server with authoritative power). I wish to host a master server which tracks player's items, rank, cash, exp, etc. In such a model, how can I prevent someone that is hosting a game (with a modified server) from spoofing the master server with invalid match results, thus gaining exp, money or rankings. Thanks. -Cody

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• Coding different states in Adventure Games

  - by Cardin

  I'm planning out an adventure game, and can't figure out what's the right way to implement the behaviour of a level depending on state of story progression. My single-player game features a huge world where the player has to interact with people in a town at various points in the game. However, depending on story progression, different things would be presented to the player, for e.g. the Guild Leader will change locations from the town square to various locations around the city; Doors would only unlock at certain times of the day after finishing a particular routine; Different cut-screen/trigger events happen only after a particular milestone has been reached. I naively thought of using a switch{} statement initially to decide what the NPC should say or which he could be found at, and making quest objectives interact-able only after checking a global game_state variable's condition. But I realised I would quickly run into a lot of different game states and switch-cases in order to change the behaviour of an object. That switch statement would also be massively hard to debug, and I guess it might also be hard to use in a level editor. So I thought, instead of having a single object with multiple states, maybe I should have multiple instances of the same object, with a single state. That way, if I use something like a level editor, I can put an instance of the NPC at all the different locations he could ever appear at, and also an instance for each conversation state he has. But that means there'll be a lot of inactive, invisible game objects floating around the level, which might be trouble for memory, or simply hard to see in a level editor, i don't know. Or simply, make an identical, but separate level for each game state. This feels the cleanest and bug-free way to do things, but it feels like massive manual work making sure each version of the level is really identical to each other. All my methods feel so inefficient, so to recap my question, is there a better or standardised way to implement behaviour of a level depending on state of story progression? PS: I don't have a level editor yet - thinking of using something like JME SDK or making my own.

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• Game component causes game to freeze

  - by ChocoMan

  I'm trying to add my camera component to Game1 class' constructor like so: Camera camera; // from class Camera : GameComponent .... public Game1() { graphics = new GraphicsDeviceManager(this); this.graphics.PreferredBackBufferWidth = screenWidth; this.graphics.PreferredBackBufferHeight = screenHieght; this.graphics.IsFullScreen = true; Content.RootDirectory = "Content"; camera = new Camera(this); Components.Add(camera); } From the just adding the last two lines, when I run the game, the screen freezes then gives me this message: An unhandled exception of type 'System.ComponentModel.Win32Exception' occurred in System.Drawing.dll Additional information: The operation completed successfully

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• Geometry Shader: distortions

  - by Christophe Lionet

  This is a cross-question from Stack Overflow, I thought it would be more appropriate here. There is a lot of code I could be posting. To avoid overloading the page with code, I will post any part of the code if requested. I am working from the ParticleGS DirectX10 sample, to build a geometry shader based particle system in DirectX 11. Using the sample code, and changing it to my liking, I am able to draw a single quad (which is essentially one particle constantly recreating itself). However, I noticed a problem which was similar to one I once had: the rendered shape is distorted. Here is a video showcasing what is happening. http://youtu.be/6NY_hxjMfwY Now, I used to have this issue when using several effects together, when I realised that I needed to explicitely set the geometry shader to null for the other effects. I solved this problem, as you can see in the video, as the rest of the scene is drawing properly. Note that some sides are being culled somehow, although I turned off culling in my main render state. The texturing is fine too, the texture draws with appropriate proportions relative to the quad. I really don't see what I could be doing wrong here... what would cause the geometry shader to behave in such a way? Again, I will post any piece code you will request.

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• MD5 vertex skinning problem extending to multi-jointed skeleton (GPU Skinning)

  - by Soapy

  Currently I'm trying to implement GPU skinning in my project. So far I have achieved single joint translation and rotation, and multi-jointed translation. The problem arises when I try to rotate a multi-jointed skeleton. The image above shows the current progress. The left image shows how the model should deform. The middle image shows how it deforms in my project. The right shows a better deform (still not right) inverting a certain value, which I will explain below. The way I get my animation data is by exporting it to the MD5 format (MD5mesh for mesh data and MD5anim for animation data). When I come to parse the animation data, for each frame, I check if the bone has a parent, if not, the data is passed in as is from the MD5anim file. If it does have a parent, I transform the bones position by the parents orientation, and the add this with the parents translation. Then the parent and child orientations get concatenated. This is covered at this website. if (Parent < 0){ ... // Save this data without editing it } else { Math3::vec3 rpos; Math3::quat pq = Parent.Quaternion; Math3::quat pqi(pq); pqi.InvertUnitQuat(); pqi.Normalise(); Math3::quat::RotateVector3(rpos, pq, jv); Math3::vec3 npos(rpos + Parent.Pos); this->Translation = npos; Math3::quat nq = pq * jq; nq.Normalise(); this->Quaternion = nq; } And to achieve the image to the right, all I need to do is to change Math3::quat::RotateVector3(rpos, pq, jv); to Math3::quat::RotateVector3(rpos, pqi, jv);, why is that? And this is my skinning shader. SkinningShader.vert #version 330 core smooth out vec2 vVaryingTexCoords; smooth out vec3 vVaryingNormals; smooth out vec4 vWeightColor; uniform mat4 MV; uniform mat4 MVP; uniform mat4 Pallete[55]; uniform mat4 invBindPose[55]; layout(location = 0) in vec3 vPos; layout(location = 1) in vec2 vTexCoords; layout(location = 2) in vec3 vNormals; layout(location = 3) in int vSkeleton[4]; layout(location = 4) in vec3 vWeight; void main() { vec4 wpos = vec4(vPos, 1.0); vec4 norm = vec4(vNormals, 0.0); vec4 weight = vec4(vWeight, (1.0f-(vWeight[0] + vWeight[1] + vWeight[2]))); normalize(weight); mat4 BoneTransform; for(int i = 0; i < 4; i++) { if(vSkeleton[i] != -1) { if(i == 0) { // These are interchangable for some reason // BoneTransform = ((invBindPose[vSkeleton[i]] * Pallete[vSkeleton[i]]) * weight[i]); BoneTransform = ((Pallete[vSkeleton[i]] * invBindPose[vSkeleton[i]]) * weight[i]); } else { // These are interchangable for some reason // BoneTransform += ((invBindPose[vSkeleton[i]] * Pallete[vSkeleton[i]]) * weight[i]); BoneTransform += ((Pallete[vSkeleton[i]] * invBindPose[vSkeleton[i]]) * weight[i]); } } } wpos = BoneTransform * wpos; vWeightColor = weight; vVaryingTexCoords = vTexCoords; vVaryingNormals = normalize(vec3(vec4(vNormals, 0.0) * MV)); gl_Position = wpos * MVP; } The Pallete matrices are the matrices calculated using the above code (a rotation and translation matrix get created from the translation and quaternion). The invBindPose matrices are simply the inverted matrices created from the joints in the MD5mesh file. Update 1 I looked at GLM to compare the values I get with my own implementation. They turn out to be exactly the same. So now i'm checking if there's a problem with matrix creation... Update 2 Looked at GLM again to compare matrix creation using quaternions. Turns out that's not the problem either.

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• Orthographic Zooming with 0,0 at top/left

  - by Sean M.

  I'm trying to implement zooming on my 2D game. Since it's using orthographic projection, I thought it would be easy to implement zooming. After looking around the internet, I found a bunch of explanations and samples on how to do this if (0,0) is the center of the screen with the orthographic projection. The problem is, my ortho projection has (0,0) at the top-left (similar to XNA/Monogame, and a couple others). I could not find any examples about how to implement zooming to the center of the screen when the center is not (0,0). And help/links/code examples would be greatly appreciated.

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• 2D game editor with SDK or open format (Windows)

  - by Edward83

  I need 2d editor (Windows) for game like rpg. Mostly important features for me: Load tiles as classes with attributes, for example "tile1 with coordinates [25,30] is object of class FlyingMonster with speed=1.0f"; Export map to my own format (SDK) or open format which I can convert to my own; As good extension feature will be multi-tile brush. I wanna to choose one or many tiles into one brush and spread it on canvas.

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• Out of Memory when building an application

  - by Jacob Neal

  I have quite a major problem with my Multimedia Fusion 2 game. I finished it months ago, however, the only thing keeping me from finally compiling the game into an executable file is this error message that pops up every time I try to, simply saying, "Out of Memory". Its highly frustrating to be halted at this point by this message, and I tried everything I could come up with to fix it including compressing the runtime and sounds and increasing the proity of MMF2 all the way to realtime in the task manager. Im begging someone to toss me a bone on this problem, and any advice at all would be much appreciated.

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• How do you stop OgreBullet Capsule from falling over?

  - by Nathan Baggs

  I've just started implementing bullet into my Ogre project. I followed the install instructions here: http://www.ogre3d.org/tikiwiki/OgreBullet+Tutorial+1 And the rest if the tutorial here: http://www.ogre3d.org/tikiwiki/OgreBullet+Tutorial+2 I got that to work fine however now I wanted to extend it to a handle a first person camera. I created a CapsuleShape and a Rigid Body (like the tutorial did for the boxes) however when I run the game the capsule falls over and rolls around on the floor, causing the camera swing wildly around. I need a way to fix the capsule to always stay upright, but I have no idea how Below is the code I'm using. (part of) Header File OgreBulletDynamics::DynamicsWorld *mWorld; // OgreBullet World OgreBulletCollisions::DebugDrawer *debugDrawer; std::deque<OgreBulletDynamics::RigidBody *> mBodies; std::deque<OgreBulletCollisions::CollisionShape *> mShapes; OgreBulletCollisions::CollisionShape *character; OgreBulletDynamics::RigidBody *characterBody; Ogre::SceneNode *charNode; Ogre::Camera* mCamera; Ogre::SceneManager* mSceneMgr; Ogre::RenderWindow* mWindow; main file bool MinimalOgre::go(void) { ... mCamera = mSceneMgr->createCamera("PlayerCam"); mCamera->setPosition(Vector3(0,0,0)); mCamera->lookAt(Vector3(0,0,300)); mCamera->setNearClipDistance(5); mCameraMan = new OgreBites::SdkCameraMan(mCamera); OgreBulletCollisions::CollisionShape *Shape; Shape = new OgreBulletCollisions::StaticPlaneCollisionShape(Vector3(0,1,0), 0); // (normal vector, distance) OgreBulletDynamics::RigidBody *defaultPlaneBody = new OgreBulletDynamics::RigidBody( "BasePlane", mWorld); defaultPlaneBody->setStaticShape(Shape, 0.1, 0.8); // (shape, restitution, friction) // push the created objects to the deques mShapes.push_back(Shape); mBodies.push_back(defaultPlaneBody); character = new OgreBulletCollisions::CapsuleCollisionShape(1.0f, 1.0f, Vector3(0, 1, 0)); charNode = mSceneMgr->getRootSceneNode()->createChildSceneNode(); charNode->attachObject(mCamera); charNode->setPosition(mCamera->getPosition()); characterBody = new OgreBulletDynamics::RigidBody("character", mWorld); characterBody->setShape( charNode, character, 0.0f, // dynamic body restitution 10.0f, // dynamic body friction 10.0f, // dynamic bodymass Vector3(0,0,0), Quaternion(0, 0, 1, 0)); mShapes.push_back(character); mBodies.push_back(characterBody); ... }

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• Decal implementation

  - by dreta

  I had issues finding information about decals, so maybe this question will help others. The implementation is for a forward renderer. Could somebody confirm if i got decal implementation right? You define a cube of any dimension that'll define the projection volume in common space. You check for triangle intersection with the defined cube to recieve triangles that the projection will affect. You clip these triangles and save them. You then use matrix tricks to calculate UV coordinates for the saved triangles that'll reference the texture you're projecting. To do this you take the vectors representing height, width and depth of the cube in common space, so that f.e. the bottom left corner is the origin. You put that in a matrix as the i, j, k unit vectors, set the translation for the cube, then you inverse this matrix. You multiply the vertices of the saved triangles by this matrix, that way you get their coordinates inside of a 0 to 1 size cube that you use as the UV coordinates. This way you have the original triangles you're projecting onto and you have UV coordinates for them (the UV coordinates are referencing the texture you're projecting). Then you rerender the saved triangles onto the scene and they overwrite the area of projection with the projected image. Now the questions that i couldn't find answers for. Is the last point right? I've never done software clipping, but it seems error prone enough, due to limited precision, that the'll be some z fighting occuring for the projected texture. Also is the way of getting UV coordinates correct?

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• What is a better abstraction layer for D3D9 and OpenGL vertex data management?

  - by Sam Hocevar

  My rendering code has always been OpenGL. I now need to support a platform that does not have OpenGL, so I have to add an abstraction layer that wraps OpenGL and Direct3D 9. I will support Direct3D 11 later. TL;DR: the differences between OpenGL and Direct3D cause redundancy for the programmer, and the data layout feels flaky. For now, my API works a bit like this. This is how a shader is created: Shader *shader = Shader::Create( " ... GLSL vertex shader ... ", " ... GLSL pixel shader ... ", " ... HLSL vertex shader ... ", " ... HLSL pixel shader ... "); ShaderAttrib a1 = shader->GetAttribLocation("Point", VertexUsage::Position, 0); ShaderAttrib a2 = shader->GetAttribLocation("TexCoord", VertexUsage::TexCoord, 0); ShaderAttrib a3 = shader->GetAttribLocation("Data", VertexUsage::TexCoord, 1); ShaderUniform u1 = shader->GetUniformLocation("WorldMatrix"); ShaderUniform u2 = shader->GetUniformLocation("Zoom"); There is already a problem here: once a Direct3D shader is compiled, there is no way to query an input attribute by its name; apparently only the semantics stay meaningful. This is why GetAttribLocation has these extra arguments, which get hidden in ShaderAttrib. Now this is how I create a vertex declaration and two vertex buffers: VertexDeclaration *decl = VertexDeclaration::Create( VertexStream<vec3,vec2>(VertexUsage::Position, 0, VertexUsage::TexCoord, 0), VertexStream<vec4>(VertexUsage::TexCoord, 1)); VertexBuffer *vb1 = new VertexBuffer(NUM * (sizeof(vec3) + sizeof(vec2)); VertexBuffer *vb2 = new VertexBuffer(NUM * sizeof(vec4)); Another problem: the information VertexUsage::Position, 0 is totally useless to the OpenGL/GLSL backend because it does not care about semantics. Once the vertex buffers have been filled with or pointed at data, this is the rendering code: shader->Bind(); shader->SetUniform(u1, GetWorldMatrix()); shader->SetUniform(u2, blah); decl->Bind(); decl->SetStream(vb1, a1, a2); decl->SetStream(vb2, a3); decl->DrawPrimitives(VertexPrimitive::Triangle, NUM / 3); decl->Unbind(); shader->Unbind(); You see that decl is a bit more than just a D3D-like vertex declaration, it kinda takes care of rendering as well. Does this make sense at all? What would be a cleaner design? Or a good source of inspiration?

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• Rotating a view of a chunked 2d tilemap

  - by Danie Clawson

  I'm working on a top-down (oblique) tile-based engine. I would like for the tiles to have a definable height in the world, with Characters being occluded by them, etc. This has led to a desire to be able to "rotate" the view of the world, even though I'm using all hand-drawn graphics and blitting. Therefor, I need to rotate the actual world itself, or change how the Camera traverses these arrays. How can, or should, I create individual rotations of 90 degrees, when I have multi-dimensional arrays? Is it faster to actually rotate the array, to access it differently, or to create pre-computed accessor(?) arrays, something like how my chunks work? How can I rotate an individual chunk, or set of chunks? Currently I establish my tile grid like this (tile height not included): function Surface(WIDTH, HEIGHT) { WIDTH = Math.max(WIDTH-(WIDTH%TPC), TPC); HEIGHT = Math.max(HEIGHT-(HEIGHT%TPC), TPC); this.tiles = []; this.chunks = []; //Establish tiles for(var x = 0; x < WIDTH; x++) { var col = [], ch_x = Math.floor(x/TPC); if(!this.chunks[ch_x]) this.chunks.push([]); for(var y = 0; y < HEIGHT; y++) { var tile = new Tile(x, y), ch_y = Math.floor(y/TPC); if(!this.chunks[ch_x][ch_y]) this.chunks[ch_x].push([]); this.chunks[ch_x][ch_y].push(tile); col.push(tile); } this.tiles.push(col); } }; Even some basic advice on my data struct would be much appreciated.

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• Geometry shader for multiple primitives

  - by Byte56

  How can I create a geometry shader that can handle multiple primitives? For example when creating a geometry shader for triangles, I define a layout like so: layout(triangles) in; layout(triangle_strip, max_vertices=3) out; But if I use this shader then lines or points won't show up. So adding: layout(triangles) in; layout(triangle_strip, max_vertices=3) out; layout(lines) in; layout(line_strip, max_vertices=2) out; The shader will compile and run, but will only render lines (or whatever the last primitive defined is). So how do I define a single geometry shader that will handle multiple types of primitives? Or is that not possible and I need to create multiple shader programs and change shader programs before drawing each type?

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• Question about Target parameter of Matrix.CreateLookAt

  - by manning18

  I have a newbie question that's causing me a little bit of confusion when experimenting with cameras and reading other peoples implementations - does this parameter represent a point or a vector? In some examples I've seen people treat it like a specific point they are looking at (eg a position in the world), other times I see people caching the orientation of the camera in a rotation matrix and simply using the Matrix.Forward property as the "target", and other times it's a vector that's the result of targetPos - camPos and also I saw a camPos + orientation.Forward I was also just playing around with hard-coded target positions with same direction eg 1 to 10000 with no discernible difference in what I saw in the scene. Is the "Target" parameter actually a position or a direction (irrespective of magnitude)? Are there any subtle differences in behaviors, common mistakes or gotchas that are associated with what values you provide, or HOW you provide this paramter? Are all the methods I mentioned above equivalent? (sorry, I've only recently started and my math is still catching up)

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• Rotating object along bezier curve: not rotating enough?

  - by Paul

  I tried to follow the instructions from the threads on the forum (Cocos2d rotating sprite while moving with CCBezierBy) with Unity, in order to rotate my object as it moves along a bezier curve. But it does not rotate enough, the angle is too low, it goes up to 6 instead of 90 for example, as you can see on this image (the y eulerAngle is at 6, I would expect it to be around 90 with this curve) : Would you know why it does this? And how to make the rotation toward the next point? Here is the code (in c# with Unity) : (I am comparing x and z to get the angle, and adding the angle to eulerAngles.y so that it rotates around the y axis) void Update () { if ( Input.GetKey("d") ) start = true; if ( start ){ myTime = Time.time; start = false; } float theTime = (Time.time - myTime) *0.5f; if ( theTime < 1 ) { car.position = Spline.Interp( myArray, theTime );//creates the bezier curve counterBezier += Time.deltaTime; //compare 2 positions after 0.1f if ( counterBezier > 0.1f ){ counterBezier = 0; cbDone = false; newpos = car.position; float angle = Mathf.Atan2(newpos.z - oldpos.z, newpos.x - oldpos.x); angle += car.eulerAngles.y; car.eulerAngles = new Vector3(0,angle,0); } else if ( counterBezier > 0 && !cbDone ){ oldpos = car.position; cbDone = true; } Thanks

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• What are some valuable conferences for game developers?

  - by Tommy

  Lately I was thinking of visiting a Game Developer Conference and so I search the Internet, but I didn't find a thorough list of available Conferences. Now I know some of them, like the GDC in San Francisco but I was wondering, what other Game Developer Conferences are out there. So my question is: What Game Dev Conferences do you know, that are valuable for Game Developers and Game Designers? Have you visited one of these Conferences yourself? Is there a skill level needed to appreciate such a Conference? I am aware, that there is no "true" answer to this question, but I think, that an overview over existing Conferences could be usefull for all levels of game developers.

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• 2D Tile-Based Concept Art App

  - by ashes999

  I'm making a bunch of 2D games (now and in the near future) that use a 2D, RPG-like interface. I would like to be able to quickly paint tiles down and drop character sprites to create concept art. Sure, I could do it in GIMP or Photoshop. But that would require manually adding each tile, layering on more tiles, cutting and pasting particular character sprites, etc. and I really don't need that level of granularity; I need a quick and fast way to churn out concept art. Is there a tool that I can use for this? Perhaps some sort of 2D tile editor which lets me draw sprites and tiles given that I can provide the graphics files.

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• JOGL hardware based shadow mapping - computing the texture matrix

  - by axel22

  I am implementing hardware shadow mapping as described here. I've rendered the scene successfully from the light POV, and loaded the depth buffer of the scene into a texture. This texture has correctly been loaded - I check this by rendering a small thumbnail, as you can see in the screenshot below, upper left corner. The depth of the scene appears to be correct - objects further away are darker, and that are closer to the light are lighter. However, I run into trouble while rendering the scene from the camera's point of view using the depth texture - the texture on the polygons in the scene is rendered in a weird, nondeterministic fashion, as shown in the screenshot. I believe I am making an error while computing the texture transformation matrix, but I am unsure where exactly. Since I have no matrix utilities in JOGL other then the gl[Load|Mult]Matrix procedures, I multiply the matrices using them, like this: void calcTextureMatrix() { glPushMatrix(); glLoadIdentity(); glLoadMatrixf(biasmatrix, 0); glMultMatrixf(lightprojmatrix, 0); glMultMatrixf(lightviewmatrix, 0); glGetFloatv(GL_MODELVIEW_MATRIX, shadowtexmatrix, 0); glPopMatrix(); } I obtained these matrices by using the glOrtho and gluLookAt procedures: glLoadIdentity() val wdt = width / 45 val hgt = height / 45 glOrtho(wdt, -wdt, -hgt, hgt, -45.0, 45.0) glGetFloatv(GL_MODELVIEW_MATRIX, lightprojmatrix, 0) glLoadIdentity() glu.gluLookAt( xlook + lightpos._1, ylook + lightpos._2, lightpos._3, xlook, ylook, 0.0f, 0.f, 0.f, 1.0f) glGetFloatv(GL_MODELVIEW_MATRIX, lightviewmatrix, 0) My bias matrix is: float[] biasmatrix = new float[16] { 0.5f, 0.f, 0.f, 0.f, 0.f, 0.5f, 0.f, 0.f, 0.f, 0.f, 0.5f, 0.f, 0.5f, 0.5f, 0.5f, 1.f } After applying the camera projection and view matrices, I do: glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR) glTexGenfv(GL_S, GL_EYE_PLANE, shadowtexmatrix, 0) glEnable(GL_TEXTURE_GEN_S) for each component. Does anybody know why the texture is not being rendered correctly? Thank you.

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• Is finding graph minors without single node pinch points possible?

  - by Alturis

  Is it possible to robustly find all the graph minors within an arbitrary node graph where the pinch points are generally not single nodes? I have read some other posts on here about how to break up your graph into a Hamiltonian cycle and then from that find the graph minors but it seems to be such an algorithm would require that each "room" had "doorways" consisting of single nodes. To explain a bit more a visual aid is necessary. Lets say the nodes below are an example of the typical node graph. What I am looking for is a way to automatically find the different colored regions of the graph (or graph minors)

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• Multiple Audio listeners in Scene

  - by Kevin Jensen Petersen

  THIS IS UNITY Im trying to make a FPS game over networking, it works fine. But now, when im trying to implement sound, it won't work. My guess would be, to add a Audio listener to the prefab, that gets instansiated whenever a player connects to the server, however the problem about this is that each player's audiolistener have been switched out which the other player(s), so the AudioSource won't play at the player, but at someone else in the game. Any suggestions ?

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• [JOGL] My program is too slow, how can I profile with Eclipse?

  - by nkint

  My simple opengl program is really toooo slow and not fluid. I'm rendering 30 sphere with simple illumination and simple materials. The only complex computing stuff I do is a collision detection between ray-mouse and spheres (that works ok and i do it only in mouseMoved) I'm not using any threads, just an animator to move spheres. How can I profile my jogl project? Or maybe (most probable...) I have some opengl instructions that I don't understand and make render particular accurate (or back face rendering that I don't need or whatever I don't know exactly I'm just entering the opengl world)

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• Bodies do not stay sticked together by joint in retina display

  - by Mike JM

  I'm rehearsing on Box2D revolute joints. Everything's going pretty well except for one thing. For some reason bodies joined together with revolute joints do not stay sticked, they start getting apart from each other from the app start when I run it on retina device or simulator. On non retina device it works just fine, as expected. Here's the screenshot of the non-retina version: And here's the behavior when I run the same app on retina device/simulator: I'm taking content scale factor into account.

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